Merge "Allow tapping on app icon for second split app." into sc-v2-dev am: 03396d4fba am: 8a1749f0d9

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15900195

Change-Id: I5f03e6346c0c28bdbe28b0e7d49026c166a67cfe